Commutator-truing machine.



0. E. HUNT.

GOMMUTATOR TRUING MACHINE.

APPLICATION rum) r33; 1, 1910.

971,253. Patented 0013.4, 1910.

2 SHEETS-SHEET 2.

OSMAN E. HUNT, OF EAGLE GROVE, IOWA.

COMMUTATOR-TRUING MACHINE.

Specification of Letters Patent.

Patented Got. 4, 1910.

Application filed February 1, 1910. Serial No. 541,284.

T all whom it may concern:

Be it known that I, OSMAN E. HUNT, a citizen of the United States, residing at Eagle Grove, in the county of Wright and State of Iowa, have invented certain new and useful Improvements in Commutator- Truing Machines, of which the following is a specification.

This invention relates to dynamo-electric machines, referring particularly to a device for truing the commutators of such machines.

An object of this invention is to construct an adjustable frame for engagement about the commutator without the necessity of removing the commutator from the machine, the frame being adapted to various heights and widths of the machines upon. which the commutators are employed. The frame is adapted to be attached to the rocker arms of the dynamo when the brushes are detached therefrom, and for this reason the frame is constructed to accommodate itself to arms of various forms and to arms which are spaced at various distances apart.

This invention has for another object the provision of an improved carriage for supporting and for feeding the cutting tool during the operation of the machine. This object contemplating the formation of a carriage which is composed of but few parts, the parts being so formed and assembled as to produce a durable and economical device which is positively fed across the commutator, and upon which the cutting tool may be adjusted at various angles and clamped rigidly in such adjusted position.

A. further object of this invention is to provide the carriage with a supporting frame for holding the armature when removed from the machine, the supporting frame being adjustable to retain armatures irrespective of their size.

For a full understanding of the invention reference is to be had to the following description and accompanying drawings, in which Figure 1 is a perspective view of the truing machine as applied to a dynamo. Fig. 2 is a transverse section through the central portion of the device. Fig. 8 is a longitudinal section through the tool carriage and support therefor, and Fig. 4 is a side elevation of a modified form of the truing frame.

Corresponding and like parts are referred to in the following description and indicated in all the views of the accompanying drawings by the same reference characters.

Referring to the drawings the numeral 10 designates a pair of uprights which are of tubular formation and are supported in position by circular bases 11 which are disposed, preferably, in threaded relation with the uprights 10. The bases 11 are formed of circular plates which are suitably apertured for the reception of screws, bolts, or the like, by means of which the frame may be permanently secured to the floor. The uprights 10 are provided at their central portions with sleeves 12 which are adjustably secured upon the uprights 10 through the medium of setscrews 13. The sleeves 12 are each proveded with inwardly extending ears 14; having the outer faces thereof flattened for the reception of a brace 15. The brace 15 carries clamping bolts 16 at its opposite ends in apertures 17 to admit of the adjustment of the sleeves 12 with respect to their distances from one another.

It will be observed from Fig. 2 that the ears 14: are provided with longitudinal slots 17 through which the bolts 16 are engaged and are adapted for longitudinal movement. The uprights 10 are further provided with upper sleeves 18 having sockets 19 for the reception of the inner ends of rods 20. The rods 20 extend horizontally and outwardly from the upper sleeves 18 and are adapted for engagement with rocker arms 21 of a dynamo. The outer arms of the rods 20 are provided with castings 22 which are slightly elongated and suitably apertured for the reception of the rods 20 through the lower ends of the same, the rods 20 being secured in adjusted position through the castings 22 by means of set-screws 23. The upper ends of the castings 22 are trans versely recessed for the reception of the lower ends of the rocker arms 21 which are secured in such position through the medium of pins 24: which are engaged through the castings 22 and the apertures through the lower ends of the rocker arms 21. At one side of the frame the rod 20 is provided with a head 25 which is angularly formed, and having transverse grooves 26 in its upper face for the reception of the supporting rod 20. The head 25 is provided with an eye-bolt 27 which is positioned through a longitudinal slot 28 formed through the horizontal portion of the head 25 and centrally of the same. The eye-bolt 27 encircles the rod and, under the action of the clamping nut 29 secures the rod 20 in one of the grooves 26, the depending portion or flange of the head receives thereagainst a shank 30 which is retained thereon by a clamping bolt 31. The upper end of the shank 30 carries a guide 32 which is arranged in longitudinal alinement with the rod 20 and which is provided at its opposite longitudinal edges with upwardly tending and inwardly turned flanges 33 to receive the flared lower edges 3% of the tool carriage 35. The carriage 35 is formed of a hollow casting of substantially U-cross section, and having the edges of the same flared outwardly to engage with the guide 32. The outer flange 33 of the guide 32 is provided with a take-up strip 36 which is disposed against the inner face of the outer flange 33 and adapted for engagement against the adjacent up-turned edge 3% of the carriage 33. With this strip 36 the wear incident to the reciprocation of the carriage 35 upon the flanges and the outturned edges can be taken up so that the carriage will be retained upon the guide and prevent the upward movement relative thereto. Centrally from the carriage 35 are upwardly extended a pair of bolts 37 which are arranged in offsetrelation relative to one another and which carry upon their upper ends a clamping bar 38 which is adapted to rest upon a cutting tool 39. The cutting tool 39 is located across the upper face of the carriage 35 beneath the clamp-bar 38 and is held rigidly in position through the medium of clamping nuts 40 which are disposed in threaded relation upon the upper ends of the bolts 37 and adapted to feed the clampbar 38 downwardly. It is thus observed that the cutting tool 39 can be swung into various angles beneath the clamp bar 38, and that the same can be moved longitudinally across the upper face of the carriage The inner end of the head 25 is provided with a transverse rod 41 which extends therethrough, and beneath the opposite rod 20 where it is passed through a socket L2 which is carried by the rod 20. The socket 42 is formed of a casting in the shape of two collars which are arranged at right angles to one another, the upper of the collars being engaged about the rod 20, while the lower collar receives the end of the transverse rod 41. The rod 11 is employed for the purpose of bracing the head 25 and of insuring the stability of the guide 32 during the cutting action of the tool 39 upon the commutator. The socket 42 is carried upon the rod 20 in parallel relation with the head and is adapted for longitudinal adjustment upon the rod 20. The socket 42 is provided with set-screws 43 which engage through the collar and against the outer faces of the rods 20 and 1-1.

The guide is provided centrally of the longitudinal edges thereof and adjacent its inner end with a lug 62 which carries a threaded shank 63 for engagement within the upper face of the guide 32 in order to hold the lug G2 rigidly in position. The upper end of the lug 62 is provided with a threaded aperture through which is eXtend ed a feed-screw Get having its forward end passed through the front wall of the carriage The feed-screw 6 carries a loose sleeve 65 upon its outer end for engagement against the carriage 35 and to cooperate with a fixed collar 66 which is formed upon the feed-screw 64 against the inner side of the front wall of the carriage The collars and 6 are adapted to prevent the longitudinal movement of the feed-screw 6% relative to the carriage 35. A crank-arm 6'? is rigidly positioned upon the outer end of the feed-screw 6-1 to impart rotation to the feed-screw and move the carriage 35 longitudinally with respect to the lug G2. Y'Vith this construct-ion the rods 20 are secured to the rocker-arms 21 through the medium of the castings 22 in order to dispose the frame about the commutator of the machine. The

sleeves 12 are adjusted vertically so as tobeneath the commutator, and the bolts 16 are positioned in the apertures 17 so as to position the uprights 10 in spaced relation and at the opposite sides of the rocker arms 21. he head 25 is now adjusted to bring the cutting tool 39 in contact with the commutator. As the commutator is rotated, the operator grasps the crank 67 and rotates the feed-screw 6 1 to move the carriage 35 longitudinally within the guide The clamping nuts 40 are released to loosen the clampbar 38, whereupon the cutting tool 39 is arranged at the proper angle to engage tha portion of the commutator which it is desired to trim. As the carriage 35 is moved across the commutator, the'cutting tool 39 is carried therewith and, as the guide 32 is mounted in parallel relation with the armature shaft of the dynamo, the cutting tool 39 will be maintained at an equi-distant position from the axis of the commutator to effect a uniform cutting.

The modification disclosed in Fig. 4 comprises a pair of spaced supports at through which a longitudinal shaft at?) is positioned and held rigidly in the supports 44 through which a longitudinal shaft 4:5 is positioned and held rigidly in the supports by means standard 48 is provided in its upper end with a stub-shaft 49 which is suitably journaled therethrough and which carries upon its inner end a chuck or head 50, while its outer end is provided with a pulley 51, by means of which the stub-shaft 4-9 is adapted to be rotated. The chuck 50 carries one end of an armature shaft 52, while the opposite end of the shaft 52 is held in position through the medium of a feed-screw 53 which is carried in the upper end of the standard 47. A post 54 is mounted upon the shaft- 4-5 through the medium of cylindrical socket 55 which is engaged about the shaft 45 and held in adjusted position thereon through the medium of set-screws 56. The post 54 extends upwardly and adjustably receives the shank 57 of a guide 58. The guide 58 is of similar construction with the guide 32 hereinbefore described, and slidably supports therein the carriage 59 upon which the cutting tool 60 is mounted. With this.construction which is disclosed in Fig. 4c the standards 47 and 48 may be spaced apart any desired distance to accommodate the length of the armature shaft 52 employed. The post 54 is also adjustable longitudinally upon the shaft in order to dispose the cutting tool 60 in various positions longitudinally of the frame to accommodate the position of the commutator 61.

Having thus described the invention what is claimed as new is l. A truing machine including a pair of uprights, a brace supported across said uprights to adjustably space the same apart, sleeves carried on said uprights, a pair of rods carried by said sleeves, castings adjustably disposed upon the outer ends of said rods to support the same, a head mounted for longitudinal adjustment on one of said rods, a shank disposed for vertical adjustment upon said head, and having a horizontal guide formed upon its upper end, and a reciprocating tool carriage located on the guide.

2. A truing machine including spaced up rights, sleeves mounted for adjustment upon the uprights and having cars, a brace secured to the ears, upper sleeves mounted for adjustment upon the uprights, parallel rods carried upon the upper sleeves, a head adjustably supported upon one of the par allel rods and having a transverse rod, a clamp adjustably carried upon the opposite parallel rod and engaging the transverse rod, and a tool carriage mounted for adjustment upon the head.

3. A truing machine including a pair of spaced uprights, bases carried by said uprights at their lower ends, sleeves adj ustably disposed on said uprights, ears formed upon said sleeves, a channel brace adjustably secured to said ears, upper sleeves carried by said uprights, outwardly extending rods disposed upon said upper sleeves, a head adjustably supported upon one of said rods, a clamp carried by the opposite of said rods, a transverse rod rigidly mounted on said head and adjustably engaging through said clamp, and means ror adjustablv supporting a cutting tool carried by said head.

4-. A truing machine including spaced uprights, a brace adjustably carried by the up rights, parallel rods disposed upon the uprights, a head carried by one of the parallel rods and having a transverse rod, a clamp disposed upon the opposite parallel rod and engaging the transverse rod to brace the head, and a tool carriage mounted upon said head.

5. A device as specified including a frame having spaced rods, a head carried by one of the rods and having transverse grooves in its upper face to receive the rod, an eyebolt engaging about said rod and extending through said head to clamp the rod in one of the transverse grooves, the head also having a transverse rod extending to and beneath the opposite of said first rods, a clamp carried by the opposite of said rods to adjustably support said transverse rod, and a tool carriage disposed upon the head.

6. A machine as specified including a pair of spaced rods, supporting means connected to the rods, a head supported upon one of the rods and having grooves therein to receive the rod, an eye-bolt engaging through the head and about the rod to retain the same in one of the grooves, a shank adjustably sup ported against the head and having a guide thereon, and a tool carriage mounted for reciprocation upon the carriage.

7. A machine as specified including a pair of spaced rods, means for supporting said rods, a head carried by one of said rods and having transverse grooves formed therein, an eye-bolt carried by said head and engaging about said rod to hold the same in one of the grooves, a flange depending from the outer end of said head, a shank adjustably positioned against said flange, a guide located on the upper end of said shank, and a tool carriage adjustably supported upon said guide.

8. A dynamo attachment including a pair of uprights spaced from the sides of the commutator of the dynamo, sleeves carried by the uprights, rods carried by the sleeves and arranged to engage at their outer ends with the rocker-arms of the dynamo, a head carried on one of said rods, a clamp carried by the opposite one of said rods in alinement with said head, a transverse rod carried by said head and adjustably engaging in said clamp, a guide disposed upon said head, and a toolcarriage mounted for reciprocation upon said guide, and adjacent to the commutator.

9. A dynamo attachment including spaced In testimony whereof I afiix my signature uprights, horizontal rods adjustably carried in presence of two Witnesses. by the upri hts, castin 's carried by the rods T for attachment to th rocker-arms of the OSMAN HULT' 5 dynamo and a tool-carriage mounted upon vltnesses:

the rods for adjustment against the commu- SYLVESTER FLYNN,

tator of the dynamo. S. H. VILLIAMSON. 

